hverkuil at xs4all
Jan 18, 2010, 10:52 AM
Views: 2514
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NTSC & WSS (was: ivtv TODO list)
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On Monday 18 January 2010 19:42:45 Devin Heitmueller wrote:
> On Mon, Jan 18, 2010 at 1:35 PM, Hans Verkuil <hverkuil [at] xs4all> wrote:
> > - NTSC and WSS. I still do not know how NTSC determines whether the source is
> > 4x3 or 16x9. PAL uses the WideScreen Signal (WSS). A similar feature exists
> > for NTSC, but it is unclear whether it is actually used by broadcasters.
> > Nobody seems to know.
>
> The reality is that for NTSC there is no standard. There is an NTSC
> variant of WSS discussed in the WSS specification, as well as a way of
> representing the info in EIA-608. As far as I have been able to
> gather though, neither have actually ever been used in production. If
> someone wants to offer some evidence to the contrary, I would be happy
> to add the support to tvtime and test it with some of my tuner boards
> (and fix any bugs that in the driver I find).
Does that mean that you have to adjust your TV every time the format changes!?
Usually when I am in the US and watch TV in my hotel room the picture is
always distorted. I really hope that is not normal behavior for NTSC and
widescreen TVs.
Regards,
Hans
>
> > - Replace the PCM device node with a proper ALSA device.
>
> For what it's worth, this has actually been done for the cx18 (but not
> for ivtv). I just need to do the final PULL request to get it into
> the mainline v4l-dvb.
>
> Cheers,
>
> Devin
>
>
--
Hans Verkuil - video4linux developer - sponsored by TANDBERG
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NTSC & WSS (was: ivtv TODO list)
